VSA System

Control System DTCs

VSA DTC Troubleshooting: 68-12

DTC 68-12 : Brake Pedal Position Switch Stuck ON

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the how to troubleshoot the VSA system Reading and Clearing Diagnostic Trouble Codes.






1. Brake pedal position switch performance check 1:

-1. Check the parameter(s) below with the HDS while pressing the brake pedal.






Does it indicate ON when the pedal is pressed, and OFF when the pedal is released?
-YES- Go to step 2.
-NO- Go to step 3.

2. Problem verification:

-1. Clear the DTC with the HDS.

-2. Turn the ignition switch to LOCK (0).

-3. Test-drive the vehicle at 9 mph (15 km/h) or more for 60 seconds or more.
NOTE: Drive the vehicle on the road, not on a lift.

-4. Check for DTCs with the HDS.






Is DTC 68-12 indicated?
-YES- The failure is duplicated. Go to step 6.
-NO- Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.

3. Brake pedal position switch performance check 2:

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.






-3. Check the parameter(s) below with the HDS.






Does the indicator change from ON to OFF?
-YES- Replace the brake pedal position switch Adjustments.
-NO- Go to step 4.

4. Shorted wire check (STOP SW line to power):

-1. Turn the ignition switch to LOCK (0).

-2. Short the SCS line with the HDS.

-3. Disconnect the following connector.






-4. Turn the ignition switch to ON (II).

-5. Measure the voltage between test points 1 and 2.










Is there 0.1 V or more?
-YES- Repair a short to power in the wire between the PCM and the brake pedal position switch.
-NO- The STOP SW wire is OK. Go to step 5.

5. PCM check (update or substitution):

-1. Turn the ignition switch to LOCK (0).

-2. Reconnect the following connectors.






-3. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Service and Repair.

-4. Clear the DTC with the HDS.

-5. Turn the ignition switch to LOCK (0).

-6. Test-drive the vehicle at 9 mph (15 km/h) or more for 60 seconds or more.
NOTE: Drive the vehicle on the road, not on a lift.

-7. Check for DTCs with the HDS.






Is DTC 68-12 indicated?
-YES- Go to step 6.
-NO- If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair.

6. VSA modulator-control unit check (update):

-1. Update the VSA modulator-control unit if it does not have the latest software Programming and Relearning.

-2. Turn the ignition switch to LOCK (0).

-3. Test-drive the vehicle at 9 mph (15 km/h) or more for 60 seconds or more.
NOTE: Drive the vehicle on the road, not on a lift.

-4. Check for DTCs with the HDS.






Is DTC 68-12 indicated?
-YES- Check for loose terminals in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit Service and Repair.
-NO- Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.